CN103765922A - Sound generator, sound generating apparatus, and electronic apparatus - Google Patents
Sound generator, sound generating apparatus, and electronic apparatus Download PDFInfo
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- CN103765922A CN103765922A CN201380002862.1A CN201380002862A CN103765922A CN 103765922 A CN103765922 A CN 103765922A CN 201380002862 A CN201380002862 A CN 201380002862A CN 103765922 A CN103765922 A CN 103765922A
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/03—Transducers capable of generating both sound as well as tactile vibration, e.g. as used in cellular phones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
A sound generator (1) of the embodiment of the present invention is provided with a vibrator (10), an exciter (piezoelectric vibrating element (20)), and a covering section (50). The exciter (20) is bonded on the vibrator (10) with a bonding section (40) therebetween. The covering section (50) is provided over the vibrator (10) from the exciter (20). Furthermore, at least a part of the outer circumference (40a) of the bonding section (40) is positioned further toward the inside than the outer circumference (20a) of the exciter (20), and there is a part of the covering section (50) between the vibrator (10) and the exciter (20).
Description
Technical field
Disclosed execution mode relates to acoustic generator, generating device and electronic equipment.
Background technology
Past is known, and the acoustic generator that the piezoelectric speaker of usining is representative can utilize as small-sized and slim loud speaker.Relevant acoustic generator can use as packing into the loud speaker in the electronic equipment headed by portable telephone and slim TV machine etc.
As acoustic generator, for example, there is the formation (for example referring to Patent Document 1) of the exciter (piezoelectric vibration device) that possesses vibrating body, is located at this vibrating body.This becomes by piezoelectric vibration device makes vibrating body vibration, utilizes the resonance phenomena of vibrating body to come sonorificly to form.
Look-ahead technique document
Patent documentation
Patent documentation 1:JP JP 2004-23436 communique
The summary of invention
The problem that invention will solve
But, in above-mentioned acoustic generator, because the resonance being configured to vibrating body self produces acoustic pressure, therefore, the sound that becomes the frequency of resonance crest under the frequency characteristic of acoustic pressure if for example make keeps larger acoustic pressure to be continued to produce, likely because the vibration of vibrating body causes that stress concentrates on the border at junction surface, thereby piezoelectric vibration device peels off from vibrating body, frequency characteristic change thus.
Summary of the invention
A form of execution mode is in view of above-mentioned and propose, and object is, provides and can prevent from from vibrating body, peeling off because of exciter acoustic generator, generating device and the electronic equipment that causes frequency characteristic change.
For solving the means of problem
A related acoustic generator of form of execution mode possesses: vibrating body, input electrical signal and the exciter that vibrates, join described exciter to junction surface on described vibrating body; With by described exciter to described vibrating body and the coating portion that arranges, at least a portion of the periphery at described junction surface is positioned at inner side compared with the periphery of described exciter, a part for described coating portion is present between described vibrating body and described exciter.
The effect of invention
According to the acoustic generator of execution mode form, can promote the bond strength of vibrating body and exciter, suppress exciter and peel off from vibrating body, can prevent frequency characteristic change.
Accompanying drawing explanation
Figure 1A is the diagrammatic top view of the related acoustic generator of execution mode.
Figure 1B is the A-A ' line sectional view of Figure 1A.
Fig. 2 means the junction surface shown in Fig. 1 and the coating portion diagrammatic top view of an example of the shape at position between two parties.
Fig. 3 is the B-B ' line amplification sectional view of Fig. 2.
Fig. 4 means the B-B ' line amplification sectional view of Fig. 2 of the variation of the acoustic generator that execution mode is related.
Fig. 5 means the B-B ' line amplification sectional view of Fig. 2 of the variation of the acoustic generator that execution mode is related.
Fig. 6 means the B-B ' line amplification sectional view of Fig. 2 of the variation of the acoustic generator that execution mode is related.
Fig. 7 means the B-B ' line amplification sectional view of Fig. 2 of the variation of the acoustic generator that execution mode is related.
Fig. 8 is the block diagram of generating device.
Fig. 9 is the block diagram of electronic equipment.
Embodiment
Below, with reference to accompanying drawing, describe the execution mode of the disclosed acoustic generator of the application, generating device and electronic equipment in detail.In addition, the present invention is not limited to execution mode shown below.
Figure 1A is the diagrammatic top view of observing the related acoustic generator 1 of execution mode from the vertical direction of the interarea with vibrating body 10, and Figure 1B is the A-A ' line sectional view of Figure 1A.In addition, in Figure 1B, for easy understanding, acoustic generator 1 is expanded on above-below direction, made it be out of shape to represent.
As shown in Figure 1A and 1B, the related acoustic generator 1 of execution mode possesses: vibrating body 10, exciter (piezoelectric vibration device 20) and framework 30.Relevant acoustic generator 1 is known as so-called piezoelectric speaker, utilizes the resonance phenomena of vibrating body 10 self to produce acoustic pressure.
Vibrating body 10 can form with the various materials such as resin, metal, paper.For example, can form laminal vibrating body 10 by the resin film of the polyethylene of thickness 10～200 μ m, polyimides, polypropylene etc.Resin film is owing to being the material lower with the Q value of the resilience in comparison modulus such as metallic plate and machinery, therefore by form vibrating body 10 with resin film, can make vibrating body 10 to vibrate compared with large amplitude bending, make the width of the resonance crest under the frequency characteristic of acoustic pressure wide, highly low, thereby reduce the poor of resonance crest and trough.
Input electrical signal and the exciter that vibrates is that piezoelectric vibration device 20 is laminated piezoelectric vibrating elements of bimorph type.For example, piezoelectric vibration device 20 possesses: duplexer 21; Be formed at the upper surface of duplexer 21 and the surface electrode layer of lower surface 22,23; The formed outer electrode 25,26 in side exposing with the end face of interior electrode layer 24 at duplexer 21.And externally electrode 25,26 is connected with conductor terminal 27a, 27b.
The interior electrode layer 24 of alternately laminated piezoelectric body layer 28a, the 28b of 4 layers being formed by pottery of duplexer 21,28c, 28d and 3 layers and forming.In addition, it is rectangular-shaped that piezoelectric vibration device 20 makes the interarea of upper surface side and lower face side, and piezoelectric body layer 28a, 28b and piezoelectric body layer 28c, 28d alternately change respectively the direction of polarization and polarized on thickness direction.
Then, via conductor terminal 27a, 27b, piezoelectric vibration device 20 is being executed in alive situation, the for example lower face side of piezoelectric vibration device 20, in other words piezoelectric body layer 28c, the 28d contraction of vibrating body 10 sides, piezoelectric body layer 28a, the 28b of upper surface side extends, and is so out of shape.So, piezoelectric body layer 28a, the 28b of the upper surface side of piezoelectric vibration device 20 and piezoelectric body layer 28c, the 28d of lower face side show contrary flexible manner, its result, by the bending of carrying out bimorph type by piezoelectric vibration device 20, vibrate, thereby can give constant vibration to vibrating body 10, sound is produced.
In addition, as the exciter that can be applied in the acoustic generator of present embodiment, except piezoelectric vibration device 20, the formation of the function encouraging so long as there is input electrical signal, for example, can be also as making the exciter of loudspeaker vibration the exciter of known moving electric type, the exciter of the exciter of electrostatic or electromagnetic type.At this, the exciter of moving electric type is electric current to be flow through be disposed at coil between the magnetic pole of permanent magnet to make the formation of coil vibration.In addition, the exciter of electrostatic makes to flow through at aspectant 2 metallic plates the formation that bias voltage and the signal of telecommunication make metal vibrating plate.In addition, the exciter of electromagnetic type is to make the signal of telecommunication flow through the formation that coil makes thin iron plate vibration.
At this, as the material that forms piezoelectric body layer 28a, 28b, 28c, 28d, can be the piezoelectric ceramic having used since the past of piezoelectrics material etc. with lead zirconate titanate (PZT), Bi lamellar compound, tungsten bronze construction compound etc. unleaded.
In addition, the expectation of the material of interior electrode layer 24 contains the metal ingredient consisting of silver and palladium and the material composition that forms piezoelectric body layer 28a, 28b, 28c, 28d.By contain the ceramic component that forms piezoelectric body layer 28a, 28b, 28c, 28d in interior electrode layer 24, can be reduced the piezoelectric vibration device 20 of the caused stress of thermal expansion difference of piezoelectric body layer 28a, 28b, 28c, 28d and interior electrode layer 24,24,24.
In addition, as the wiring being connected with conductor terminal 27a, 27b, in order to seek the low level of piezoelectric vibration device 20, preferably use and with resin film, clip the flexible wired of the metal formings such as copper or aluminium.
The piezoelectric vibration device 20 so forming is bonded on the vibration plane 10a of vibrating body 10 via the junction surface 40 being formed by bonding agent.The Thickness Ratio at the junction surface 40 that these piezoelectric vibration device 20 and vibrating body are 10 is thinner, for example, be made as below the above 20 μ m of 0.02 μ m.So, in the situation that the thickness at junction surface 40 is below 20 μ m, be easy to make the vibration of duplexer 21 to be delivered to vibrating body 10.
As junction surface 40, can use bonding agent, for example can use epoxy is resin, silicones, the known bonding agent of polyester based resin, but is not limited thereto.In addition, as the hardening of resin method of using, also can use the method arbitrarily of thermmohardening, photo-hardening or the sclerosis of lonely property etc. in bonding agent.
At this, the related acoustic generator 1 of present embodiment is by for example making a part for the dispensing area of bonding agent be positioned at inner side compared with the periphery 20a of the lower surface of piezoelectric vibration device 20, or by cure shrinkage, make at least a portion of the periphery 40a at junction surface 40 compared with the periphery 20a of piezoelectric vibration device 20, be positioned at inner side.In other words, the part between vibrating body 10 and piezoelectric vibration device 20 has the part (gap) that does not form junction surface 40.
Then, in the related acoustic generator 1 of present embodiment, a part for coating described later portion 50 is present between this gap and (part being present between gap of coating portion 50 is recited as to coating portion position 41 between two parties below).Thus, due to coating portion between two parties position 41 and vibrating body 10 engage, and coating portion is position 41 and piezoelectric vibration device 20 joints between two parties, therefore, with in gap 20 of vibrating body 10 and piezoelectric vibration devices, do not have coating portion between two parties the formation at position 41 compare, promoted the bond strength of vibrating body 10 with piezoelectric vibration device 20, thereby can suppress piezoelectric vibration device 20, from vibrating body 10, peeled off.
Particularly, by coating portion that Young's modulus is different with junction surface 40 position 41 is between two parties set 10 of piezoelectric vibration device 20 and vibrating bodies, can make resonance frequency locality inconsistent, thereby make to become mild at the acoustic pressure crest of resonance point.Thus, even if acoustic pressure is larger, under specific frequency, stress is also difficult to concentrate on the border (interface at the interface at piezoelectric vibration device 20 and junction surface 40, vibrating body 10 and junction surface 40) at junction surface 40, suppress piezoelectric vibration device 20 and peeled off from vibrating body 10, prevented frequency characteristic change.And then, by making resonance shift, can form the acoustic generator that has suppressed the remarkable frequency characteristic of having of Wave crest and wave trough.About relevant coating portion position 41He junction surface 40 between two parties, will describe in detail in the back.
Thickness and the material of upper ledge parts 30a, lower frame parts 30b are not particularly limited, and in the present embodiment, for the reason of mechanical strength and excellent corrosion resistance, use for example material of the stainless steel of thickness 100～5000 μ m.
In addition, the material of upper ledge parts 30a, lower frame parts 30b is not limited to stainless steel, so long as than the material of coating portion's 50 more difficult distortion, for example, can use hard resin, plastics, engineering plastics, pottery, glass etc., in the present embodiment, there is no particular limitation for the material of upper ledge parts 30a and lower frame parts 30b, thickness etc.And then shaped as frame shape is also not limited to rectangle, part or all that also can make interior perimembranous or peripheral part is for circular, oval, and also can make interior perimembranous or peripheral part is rhombus.
In addition, in acoustic generator 1, as shown in Figure 1B, the vibration plane 10a of piezoelectric vibration device 20 and vibrating body 10 is by 50 coatings of coating portion (coating) of resin.For example, coating portion 50 is configured to: resin is flowed in the frame of upper ledge parts 30a of framework 30 and carry out coating piezoelectric vibration device 20 etc.In addition, in Figure 1A, for easy understanding, omit the diagram of coating portion 50.
The resin that forms coating portion 50 is such as being that epoxy is that resin, acrylic resin, silicon are resin or rubber etc., but these are all illustrations, are not limited thereto.So, by carrying out coating piezoelectric vibration device 20 with coating portion 50, that can bring out appropriateness dumps (dumping) effect, suppresses resonance phenomena, and the difference of resonance crest and trough can be suppressed for less, thereby preferred.And then, external environment condition and protect piezoelectric vibration device 20 relatively.
In addition, in the related acoustic generator 1 of present embodiment, the vibration plane 10a of vibrating body 10 all by 50 coatings of coating portion, but do not need coating whole.That is, acoustic generator 1 if piezoelectric vibration device 20 and at least a portion of vibration plane 10a of vibrating body 10 of being provided with this piezoelectric vibration device 20 by 50 coatings of coating portion.
At this, describe above-mentioned junction surface 40 and coating portion position 41 between two parties in detail.Fig. 2 means junction surface 40 and the coating portion diagrammatic top view of an example of the shape at position 41 between two parties, and Fig. 3 is the B-B ' line amplification sectional view that amplifies near the Fig. 2 that represents that junction surface 40 is.
In addition, in Fig. 2, for easy understanding, dot the profile of piezoelectric vibration device 20 perspective representation junction surface 40 and coating portion position 41 between two parties, at coating portion 41 dozens, position oblique line between two parties.In addition, in Fig. 3, reduced representation piezoelectric vibration device 20, and also junction surface 40 is expanded on above-below direction its distortion is represented.
Overlooking under observation between vibrating body 10 and piezoelectric vibration device 20, be positioned at central Terrain and become junction surface 40, on the other hand, as shown in FIG. 2 and 3, the periphery 20a that is configured to the piezoelectric vibration device 20 on the vibration plane 10a of vibrating body 10 has the part (gap) that does not form junction surface 40.
At piezoelectric vibration device 20 during by 50 coating of coating portion, the resin that makes to become coating portion 50 enters and fills the above-mentioned part that does not form junction surface 40 (gap), be the part of the periphery 20a along piezoelectric vibration device 20 on the vibration plane 10a of vibrating body 10, form thus coating portion position 41 between two parties.
So, the related acoustic generator 1 of present embodiment is owing to having coating portion position 41 between two parties between vibrating body 10 and piezoelectric vibration device 20, in other words, a part for coating portion 50 enters into the gap being present between vibrating body 10 and piezoelectric vibration device 20, by coating portion is engaged with vibrating body 10 at position 41 between two parties, and coating portion is engaged with piezoelectric vibration device 20 at position 41 between two parties, promoted the bond strength of vibrating body 10 with piezoelectric vibration device 20, thereby can suppress piezoelectric vibration device 20, from vibrating body 10, peel off, can prevent frequency characteristic change.
In addition, even because vibrating or producing stress from outside impact, piezoelectric vibration device 20 stress nearby also can concentrate on the coating portion that consists of the relatively low resin of Young's modulus position 41 between two parties, the junction surface 40 relatively high in Young's modulus is absorbed at the interface at position 41 between two parties with coating portion, thereby junction surface 40 and piezoelectric vibration device 20 and vibrating body 10 engage and vibrating body 10 is maintained with engaging of coating portion 50, can prevent frequency characteristic change.
Particularly, by coating portion that Young's modulus is different with junction surface 40 position 41 is between two parties being set between piezoelectric vibration device 20 and vibrating body 10, resonance frequency locality is inconsistent, at the acoustic pressure crest of resonance point, becomes mild.For this reason, even if acoustic pressure is larger, under specific frequency, stress is also difficult to concentrate on the border at junction surface 40, has suppressed piezoelectric vibration device 20 and has peeled off from vibrating body, has prevented frequency characteristic change.And then, by making resonance shift, can make the acoustic generator with good frequency characteristic that has suppressed peak valley.
In addition, coating portion by forming the periphery 20a along piezoelectric vibration device 20 that deformation is large with the large resin of mechanical loss is position 41 between two parties, it is large that the loss of vibration becomes, can also be at the frequency field across wider, make the crest shape of the acoustic pressure under the resonance frequency of vibrating body 10 mild, reduce the poor of resonance crest under the frequency characteristic of acoustic pressure and trough (resonance wave peak-to-peak paddy in), thereby can suppress as much as possible the frequency variation of acoustic pressure, lifting tonequality.
At this, as shown in Figure 2, as the coating portion of the part of coating portion 50, position 41 be between two parties preferably: with respect to the central shaft C(of the piezoelectric vibration device 20 of the vibration plane 10a quadrature with vibrating body 10, overlook centroidal the axle vertical with the vibration plane 10a of vibrating body 10 while observing piezoelectric vibration device 20) and asymmetrical shape.That is, preferably coating portion becomes the symmetric shape that central shaft C with respect to piezoelectric vibration device 20 does not have rotational symmetry etc. in position 41 between two parties.
Thus, can make coating portion between two parties position 41 size because of position different different.Therefore, can further make the width of resonance crest wide, highly low, and then, can further reduce the poor of resonance crest and trough (resonance wave peak-to-peak paddy in), thereby suppress the frequency variation of acoustic pressure, can promote tonequality.
In addition, as shown in Figure 2, as the coating portion of the part of the related coating portion 50 of present embodiment position 41 between two parties, the configuration fully that spreads all over the periphery 20a of piezoelectric vibration device 20.
So, in the situation that the periphery 40a at junction surface 40 all compared with the periphery 20a of piezoelectric vibration device 20, be positioned at inner side, in other words, the periphery 20a along piezoelectric vibration device 20 on the vibration plane 10a of vibrating body 10 and spreading all in all-round all gapped situations, can spread all over by the periphery 20a along piezoelectric vibration device 20 and configure the position 41 between two parties as the coating portion of the part of coating portion 50 all-roundly, further promoted the bond strength of vibrating body 10 with piezoelectric vibration device 20, and further reduced the poor of resonance crest under the frequency characteristic of acoustic pressure and trough (resonance wave peak-to-peak paddy in), thereby further promoted tonequality.
But the acoustic generator of present embodiment is not limited thereto, for example, also can at least a portion in the periphery 20a of piezoelectric vibration device 20 configure coating portion position 41 between two parties.
For example, because the vibration stress of piezoelectric vibration device 20 self is easy to concentrate, if configure coating portion position 41 between two parties in the bight of overlooking the piezoelectric vibration device 20 under observation, increased above-mentioned bonding area, the bond strength that can promote thus the bight of vibrating body 10 and piezoelectric vibration device 20, peels off from vibrating body 10 thereby can suppress piezoelectric vibration device 20.
And then, as shown in Figure 4, at junction surface, a part of 40 periphery 40a is positioned at inner side compared with the periphery 20a of piezoelectric vibration device 20, another part is positioned at compared with the periphery 20a of piezoelectric vibration device 20 in the situation in outside, in other words, along the periphery 20a of the piezoelectric vibration device 20 on the vibration plane 10a of vibrating body 10 and there is locally gap, do not forming the other parts in gap, in the situation that overflow at junction surface 40, at piezoelectric vibration device 20 around, mix and to have the region that the region that vibrating body 10 monomers vibrate and the structure engaging with vibrating body 10 and junction surface 40 are vibrated, because each condition of resonance is different, therefore resonance frequency is difficult consistent, can suppress further peak valley.
In addition, by being provided as the coating portion position 41 between two parties of a part for coating portion 50 in the gap forming locally, coating portion between two parties position 41He junction surface 40 engages crisscrossly, can promote the bond strength of vibrating body 10 and piezoelectric vibration device 20, and reduce resonance crest under the frequency characteristic of acoustic pressure and trough (resonance wave peak-to-peak paddy in) thus difference lifting tonequality.
In addition, preferably as shown in Figure 2, junction surface 40 overlooking observation under tool irregular shape with shape (outer peripheral face) the periphery 40a that position 41 joins of coating portion between two parties, at length, recess and protuberance replace continuous shape.
Thus, the condition of resonance that is delivered to the vibration of vibrating body 10 from piezoelectric vibration device 20 changes continuously, can make across wide frequency field the crest shape of the acoustic pressure under the resonance frequency of vibrating body 10 further mild.
In addition, preferably as shown in Figure 3, junction surface 40 with coating portion between two parties position 41 interface, in other words the cross section (for example B-B ' line cross section) having at the vibration plane 10a quadrature with vibrating body 10 with the coating portion outer peripheral face that position 41 joins between two parties at junction surface 40 is the 40b of ditch portion of curved shape.At length, preferably the ditch 40b of portion be for example set as from coating portion between two parties position 41Xiang junction surface 40 be the curved shape of convex.
Thus, will form the resin-coated in the coating operation of piezoelectric vibration device 20 of coating portion 50, and be easy to resin filling, to the above-mentioned part that does not form junction surface 40, easily to form coating portion position 41 between two parties.
In addition, as described above, because coating portion is configured in the position that does not form junction surface 40 in position 41 between two parties between vibrating body 10 and piezoelectric vibration device 20, be only therefore that shape or the thickness that changes junction surface 40 just can easily change coating portion shape or the thickness at position 41 between two parties.
In addition, acoustic generator 1 also can be configured to as shown in Figure 5: the coating portion in the part as coating portion 50 has hole 42 in position 41 between two parties.Hole diameter is now for example 0.01～100 μ m, and hole rate is for example 0.01～10%.So, by making hole be present in any person of coating portion between inside, coating portion 50 and the vibrating body 10 at position 41, between coating portion 50 and piezoelectric vibration device 20 and between coating portion 50 and junction surface 40 between two parties, the stress producing because of the vibration comprising with the parts of the integrated vibrating body 10 of piezoelectric vibration device 20 and coating portion 50 concentrates on hole 42 peripheries, and it is large that the local deformation of hole 42 peripheries becomes.Its result, makes the energy loss that produces because of vibration owing to producing effect, therefore can further reduce the poor of resonance crest and trough.
And then, as shown in Figure 6, also can between position 41 and at least one in vibrating body 10, piezoelectric vibration device 20 and junction surface 40, there is space 43 between two parties in the coating portion of the part as coating portion 50.The diameter in space 43 is now for example 0.05～100 μ m.Mix to have from piezoelectric vibration device 20 and propagate the region vibrating, the region of propagating vibration via air and to vibrating body 10, propagate the region of vibration in position 41 between two parties via coating portion to vibrating body 10 via junction surface 40.Now, because the propagation velocity of joint material 21 inside is different from airborne propagation velocity, therefore, further make resonance frequency become inhomogeneous, can the very good acoustic generator 1 of forming frequency characteristic.
As described above, in acoustic generator 1, because at least a portion of the periphery 40a at junction surface 40 is positioned at inner side compared with the periphery 20a of piezoelectric vibration device 20, make a part for coating portion 50 between vibrating body 10 and piezoelectric vibration device 20, therefore promoted the bond strength of vibrating body 10 with piezoelectric vibration device 20, thereby suppressed piezoelectric vibration device 20, from vibrating body 10, peel off, can prevent frequency characteristic change.
At this, with reference to figure 7, the related acoustic generator 1 of variation in present embodiment is described.Fig. 7 is the B-B ' line amplification sectional view that amplifies near the Fig. 2 that represents that junction surface 40 is.In addition, below, for giving prosign with the common formation of previous execution mode and description thereof is omitted.
As shown in Figure 7, in the related acoustic generator 1 of variation, it is the 40c of ditch portion of wedge shape that the outer peripheral face at junction surface 40 has in the cross section of the vibration plane 10a quadrature with vibrating body 10 (for example B-B ' line cross section).Specifically, the 40c of ditch portion for example has near 2 of the given angle roughly shapes of straight line that are used to form that become under B-B ' line cross-section the central authorities of the thickness direction between vibrating body 10 and piezoelectric vibration device 20.
So, in the related acoustic generator 1 of variation, due to junction surface 40 to have under cross-section be the 40c of ditch portion of wedge shape at the interface at position 41 between two parties with coating portion, therefore can make vibrating body 10 integral body acoustic pressure crest under resonance point further mild.Further, at the 40c of ditch portion, be easy to form above-mentioned hole at the fore-end of wedge shape, can more produce effect thus and make the energy loss that produces because of vibration, can further reduce the poor of resonance crest and trough.
In addition, as shown in Figure 8, can form generating device 2 by the acoustic generator of above-mentioned formation 1 is housed in to resonant tank 200.Resonant tank 200 is the baskets of accommodating acoustic generator 1, and the sound that acoustic generator 1 is sent is empathized and become sound wave from basket surface radiation.Relevant generating device 2 can be used separately as loud speaker, can also pack rightly various electronic equipments 3 in addition.
As described above, owing to can reduce the poor of resonance crest under the frequency characteristic of disadvantageous acoustic pressure and trough in piezoelectric speaker, so the related acoustic generator 1 of present embodiment can appropriately pack the electronic equipments 3 such as portable telephone, slim TV machine or dull and stereotyped terminal into.
In addition, as the electronic equipment 3 that can become the object that packs acoustic generator 1 into, be not limited to aforesaid portable telephone, slim TV machine or dull and stereotyped terminal etc., such as also comprise the household appliances of passing by and thinking little of tonequality as freezer, electric furnace, scavenging machine, washing machine etc.
At this, with reference to figure 9, come simple declaration to possess the electronic equipment 3 of above-mentioned acoustic generator 1.Fig. 9 is the block diagram of electronic equipment 3.Electronic equipment 3 possesses: above-mentioned acoustic generator 1, the electronic circuit being connected with acoustic generator 1, for accommodating the basket 300 of acoustic generator 1 and electronic circuit.
Particularly, as shown in Figure 9, electronic equipment 3 possesses: electronic circuit, and it comprises control circuit 301, signal processing circuit 302 and as the radio-circuit 303 of input unit; Antenna 304; With accommodate their basket 300.In addition, at Fig. 9, show the input unit based on wireless, but certainly also can arrange as the signal input based on common electric wiring.
In addition, at this, omitted the record of other electronic unit that electronic equipment 3 possesses (equipment and circuit such as display, microphone, loud speaker).In addition, in Fig. 9, exemplified with 1 acoustic generator 1, but 2 above acoustic generator 1 or other sender units can also be set.
So, electronic equipment 3 shown in Fig. 9 can reduce as much as possible the difference of resonance crest and trough and carry out blanketing frequency change when packing small-sized and slim acoustic generator 1 into, headed by the low bass zone of frequency, in high pitch region, also can integrally seek the lifting of tonequality.
In addition, at Fig. 9, as sound output equipment, exemplified with the electronic equipment 3 of direct lift-launch acoustic generator 1, but as sound output equipment, for example, can be also to have carried acoustic generator 1 to be housed in the such formation of generating device 2 in basket.
In addition, in the above-described embodiment, exemplified with 1 piezoelectric vibration device 20 is configured in to the formation on vibrating body 10, but also configurable 2 above piezoelectric vibration devices 20.In addition, at piezoelectric vibration device 20, be more than 2 in the situation that, both piezoelectric vibration device 20 can be configured on the same face of vibration plane 10a of vibrating body 10, also can be configured in two sides.In addition, making piezoelectric vibration device 20 is rectangular shape overlooking under observation, but can be also square.In addition, be illustrated in the substantial middle that piezoelectric vibration device 20 is configured in to the vibration plane of vibrating body 10, but also piezoelectric vibration device 20 can be configured in to the position of having departed from vibrating body 10 vibration plane centers.
In addition, the cascade type as piezoelectric vibration device 20 exemplified with so-called bimorph type, but can also use the piezoelectric vibration device of single piezoelectric chip type.
Those skilled in the art can easily derive further effect and variation.For this reason, form widely of the present invention is not limited to above such specific detailed and representational execution mode that characterizes and describe.Therefore, can not depart from apposition Patent right requirement scope and by the spirit or scope of the concept of the defined blanket invention of its equivalent carry out various changes.
The explanation of symbol
1 acoustic generator
2 generating devices
3 electronic equipments
10 vibrating bodies
20 piezoelectric vibration devices
30 frameworks
40 junction surfaces
40b, 40c ditch portion
41 coating portions are position between two parties
42 holes
43 spaces
50 coating portions
200 resonant tanks (basket)
300 baskets
301 control circuits
302 signal processing circuits
303 radio-circuits
304 antennas
Claims (10)
1. an acoustic generator, is characterized in that, possesses:
Vibrating body;
Input electrical signal and the exciter that vibrates;
Join described exciter to junction surface on described vibrating body; With
The coating portion being arranged to described vibrating body by described exciter,
At least a portion of the periphery at described junction surface is positioned at inner side compared with the periphery of described exciter, a part for described coating portion is present between described vibrating body and described exciter.
2. acoustic generator according to claim 1, is characterized in that,
With respect to the central shaft of the described exciter of the vibration plane quadrature with described vibrating body, a part for described coating portion is asymmetrical shape.
3. acoustic generator according to claim 1 and 2, is characterized in that,
A part for described junction surface and described coating portion is joined,
The outer peripheral face that the part with described coating portion at described junction surface is joined has concavo-convex.
4. according to the acoustic generator described in any one in claim 1～3, it is characterized in that,
In the cross section of the vibration plane quadrature with described vibrating body, the outer peripheral face at described junction surface has the ditch portion of wedge shape.
5. according to the acoustic generator described in any one in claim 1～4, it is characterized in that,
The periphery at described junction surface whole are positioned at inner side compared with the periphery of described exciter, a part for described coating portion is along the periphery of described exciter, spread all over all-round and configure.
6. according to the acoustic generator described in any one in claim 1～4, it is characterized in that,
A part for the periphery at described junction surface is positioned at inner side compared with the periphery of described exciter, another part is positioned at outside compared with the periphery of described exciter.
7. according to the acoustic generator described in any one in claim 1～6, it is characterized in that,
A part in described coating portion has hole.
8. according to the acoustic generator described in any one in claim 1～7, it is characterized in that,
Described coating portion and at least have space between any one in described vibrating body, described exciter and described junction surface.
9. a generating device, is characterized in that, at least possesses:
Acoustic generator in claim 1～8 described in any one; With
For accommodating the basket of this acoustic generator.
10. an electronic equipment, is characterized in that, at least possesses:
Acoustic generator in claim 1～8 described in any one;
The electronic circuit being connected with this acoustic generator; With
For accommodating the basket of this electronic circuit and described acoustic generator,
Described electronic equipment has the function that sound is produced by described acoustic generator.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-190695 | 2012-08-30 | ||
| JP2012190695 | 2012-08-30 | ||
| PCT/JP2013/065265 WO2014034208A1 (en) | 2012-08-30 | 2013-05-31 | Sound generator, sound generating apparatus, and electronic apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103765922A true CN103765922A (en) | 2014-04-30 |
| CN103765922B CN103765922B (en) | 2016-09-07 |
Family
ID=50183033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380002862.1A Expired - Fee Related CN103765922B (en) | 2012-08-30 | 2013-05-31 | Acoustic generator, generating device and electronic equipment |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9215531B2 (en) |
| JP (1) | JP5638169B2 (en) |
| KR (1) | KR101500587B1 (en) |
| CN (1) | CN103765922B (en) |
| WO (1) | WO2014034208A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107623888A (en) * | 2016-07-13 | 2018-01-23 | 太阳诱电株式会社 | Electro-acoustic conversion device |
| CN109308849A (en) * | 2017-07-28 | 2019-02-05 | 乐金显示有限公司 | Show equipment |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5638170B2 (en) * | 2012-09-26 | 2014-12-10 | 京セラ株式会社 | SOUND GENERATOR, SOUND GENERATOR, AND ELECTRONIC DEVICE |
| WO2017159432A1 (en) * | 2016-03-14 | 2017-09-21 | Tdk株式会社 | Magnetic memory |
| JP7105116B2 (en) * | 2018-06-22 | 2022-07-22 | 株式会社トーキン | ultrasonic sensor |
| US10631072B2 (en) * | 2018-06-25 | 2020-04-21 | Google Llc | Actuator for distributed mode loudspeaker with extended damper and systems including the same |
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| JP2010103977A (en) * | 2008-09-25 | 2010-05-06 | Kyocera Corp | Vibrator |
| WO2011162002A1 (en) * | 2010-06-25 | 2011-12-29 | 京セラ株式会社 | Acoustic generator |
| CN102547541A (en) * | 2010-12-27 | 2012-07-04 | 株式会社村田制作所 | Piezoelectric sound component |
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| US6278790B1 (en) * | 1997-11-11 | 2001-08-21 | Nct Group, Inc. | Electroacoustic transducers comprising vibrating panels |
| DE19821860A1 (en) * | 1998-05-15 | 1999-11-18 | Nokia Deutschland Gmbh | Driver for flat panel loudspeaker |
| US6751329B2 (en) * | 2000-09-21 | 2004-06-15 | New Transducers Limited | Loudspeaker driver |
| JP2004023436A (en) | 2002-06-17 | 2004-01-22 | Nihon Ceratec Co Ltd | Piezoelectric loudspeaker |
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2013
- 2013-05-31 CN CN201380002862.1A patent/CN103765922B/en not_active Expired - Fee Related
- 2013-05-31 KR KR1020137016885A patent/KR101500587B1/en active IP Right Grant
- 2013-05-31 US US14/369,790 patent/US9215531B2/en not_active Expired - Fee Related
- 2013-05-31 WO PCT/JP2013/065265 patent/WO2014034208A1/en active Application Filing
- 2013-05-31 JP JP2014524593A patent/JP5638169B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010103977A (en) * | 2008-09-25 | 2010-05-06 | Kyocera Corp | Vibrator |
| WO2011162002A1 (en) * | 2010-06-25 | 2011-12-29 | 京セラ株式会社 | Acoustic generator |
| CN102547541A (en) * | 2010-12-27 | 2012-07-04 | 株式会社村田制作所 | Piezoelectric sound component |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107623888A (en) * | 2016-07-13 | 2018-01-23 | 太阳诱电株式会社 | Electro-acoustic conversion device |
| CN109308849A (en) * | 2017-07-28 | 2019-02-05 | 乐金显示有限公司 | Show equipment |
| US10771730B2 (en) | 2017-07-28 | 2020-09-08 | Lg Display Co., Ltd. | Display apparatus |
| US11032509B2 (en) | 2017-07-28 | 2021-06-08 | Lg Display Co., Ltd. | Display apparatus with a display area and a non-display area and including a sound generator |
| CN109308849B (en) * | 2017-07-28 | 2022-03-04 | 乐金显示有限公司 | Display device |
| CN114495770A (en) * | 2017-07-28 | 2022-05-13 | 乐金显示有限公司 | Display device |
| US11616928B2 (en) | 2017-07-28 | 2023-03-28 | Lg Display Co., Ltd. | Display apparatus |
| CN114495770B (en) * | 2017-07-28 | 2024-02-09 | 乐金显示有限公司 | Device capable of outputting sound |
| US11985444B2 (en) | 2017-07-28 | 2024-05-14 | Lg Display Co., Ltd. | Display apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| US20150003641A1 (en) | 2015-01-01 |
| KR20140040680A (en) | 2014-04-03 |
| JPWO2014034208A1 (en) | 2016-08-08 |
| CN103765922B (en) | 2016-09-07 |
| WO2014034208A1 (en) | 2014-03-06 |
| US9215531B2 (en) | 2015-12-15 |
| KR101500587B1 (en) | 2015-03-09 |
| JP5638169B2 (en) | 2014-12-10 |
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